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Doctors Medicines MCQs Q&A

  1. I and II
  2. I, II and III
  3. Only I
  4. Only II
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1 Answers

Option 1 : I and II

Concept:

Sublimation: 

  • It is the process in which there is a change of state directly from solid to gas without changing into a liquid state.
    • Examples of sublimate substances: Ammonium chloride, Camphor, Iodine, Naphthalene, Dry Ice
    • When ammonium chloride is heated, it gets converted into ammonia and hydrochloric acid.
    • Common salt (also known as sodium chloride), on the other hand, does not undergo sublimation. 

Products

When heated transforms from process

Process is called

Dry ice

Solid to Gas Phase

Sublimation

Camphor

Solid to Gas Phase

Sublimation

Ice

Solid to Liquid Phase

Melting

 

 

Boiling: 

  • As the temperature of a liquid is increased, the rate of evaporation also increases.
    • A stage is reached when bubbles of vapour start forming in the body of the liquid which rises to the surface and escapes.
    • A liquid boils at a temperature at which the Saturated Vapour Pressure (S.V.P.) is equal to the external pressure.
    • At the boiling point, vapour pressure becomes equal to the external pressure.
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